Added 4.0.2 release notes (#7399)

Author: michaelgsharp

docs/release-notes/4.0.2/release-4.0.2.md

@@ -0,0 +1,10 @@
+# [ML.NET](http://dot.net/ml) 4.0.2
+
+## **Enhancements**
+- **[release/4.0] Support O3 OpenAI model mapping #7395** ([#7395](https://github.com/dotnet/machinelearning/pull/7395))
+
+
+## **Build / Test updates**
+- **[release/4.0] Update dependencies from dotnet/arcade** ([#7369](https://github.com/dotnet/machinelearning/pull/7369))
+- **[release/4.0] Update dependencies from dotnet/arcade** ([#7377](https://github.com/dotnet/machinelearning/pull/7377))
+- **[release/4.0] Update dependencies from dotnet/arcade** ([#7386](https://github.com/dotnet/machinelearning/pull/7386))